Figure 8.4 Pes4T4 Hot-Plug Event Signalling - Renesas IDT 89HPES4T4 User Manual

IDT Hot-Plug and Hot-Swap
Notes
PES4T4 User Manual
The hot-plug event signalling mechanism is the only thing that is affected when a port is configured to
use general purpose events instead of the PCIe defined hot-plug signalling mechanisms (i.e., INTx, MSI
and PME). Thus, the PCIe defined capability, status and mask bits defined in the PCIe slot capabilities,
status and control registers operate as normal and all other hot-plug functionality associated with the port
remains unchanged. INTx, MSI and PME events from other sources are also unaffected.
The enhanced hot-plug signalling mechanism supported by the PES4T4 is graphically illustrated in
Figure 8.4. This figure provides a conceptual summary of the enhanced hot-plug signalling mechanism in
the form of a pseudo logic diagram. Logic gates in this diagram are intended for conveying general
concepts, and not for direct implementation.
Slot Control
Register
Hot-Plug Interrupt
Enable
Slot Status
Register
RW
Command
Completed Enable
Command
Completed
RW
RW1C RW1C
Attention Button
Pressed Enable
Attention Button
Pressed
RW
RW1C RW1C
Power Fault
Detected Enable
Power Fault
Detected
RW
RW1C RW1C
MRL Sensor State
Changed Enable
MRL Sensor State
Changed
RW
RW1C RW1C
Presence Detected
Changed Enable
Presence Detected
Changed
RW
RW1C RW1C
Data Link Layer
State Changed Enable
Data Link Layer
State Changed
RW
RW1C RW1C

Figure 8.4 PES4T4 Hot-Plug Event Signalling

8 - 5
General Purpose Event
Enable
RW
General Purpose
Event Mechanism
Interrupt
Disable
RW
Activate INTx
Mechanism
Activate MSI
Mechanism
RW
MSI Enable
Bit
PME Enable
Bit
RW
Activate Wakeup
Mechanism
February 1, 2011